<?xml version="1.0"?>
<SAORecordList>
<SAORecord
FormatVersion="5.0"
StartTimeUTC="2026-02-28 -059 16:50:00.000"
URSICode="SAA0K"
StationName="SaoLuis"
GeoLatitude="-2.6"
GeoLongitude="315.8"
Source="Ionosonde"
SourceType="DPS-4"
ScalerType="auto">
<SystemInfo UMLStationID="903">
<FrequencyStepping StartFrequency="1.0" StopFrequency="18.0">
<LinearStepping Step="0.05" Units="MHz" />
</FrequencyStepping>
<RangeStepping StartRange="80.0" StopRange="1360.0" >
<LinearStepping Step="5.0" Units="km" />
</RangeStepping>
<AutoScaler Name="Artist5" Version="500200" ArtistFlags="1 2 0 0 0 0 0 0 0 11 0 0 0 0 0 0 0 0 0 0 "/>
<Comments>AR.5002.44 Confidence: 95% PACIFIC flags: Multiple candidates for F2x cusp</Comments>
<ContactPerson>
<Name>Dr. Mangalathayil Ali Abdu</Name>
<Affiliation>INPE, Division of Aeronomy</Affiliation>
<Address>Av dos Astronautas, 1.758 Jd. Granja - CEP: 12227-010 Sao Jose dos Campos - SP Brasil</Address>
<Email>maabdu@dae.inpe.br</Email>
</ContactPerson>
<StartTime Format="yyyy.MM.dd (DDD) HH:mm:ss" TimeZone="Coordinated Universal Time" >
2026.02.28 (059) 16:50:00</StartTime>
<SolarTerrestrialData>
<GyroFrequency Val="0.63" Model="IGRF 3.0" Altitude="300"/>
<DipAngle Val="-11.15" Model="IGRF 3.0" Altitude="300"/>
<DeclinationAngle Val="-19.74" Model="IGRF 3.0" Altitude="300"/>
<SunSpotNumber Val="-1.0" Status="predicted"/>
</SolarTerrestrialData>
<DigisondePreface Format="FF">
FF202605902281650009039031101000005018000000001107501000080502560000000040000
</DigisondePreface>
</SystemInfo>
<CharacteristicList Num="29" >
<URSI ID="00" Val="13.100" Name="foF2" Units="MHz" QL="/" DL="/" />
<URSI ID="03" Val="2.507" Name="M(D)" QL="/" DL="/" />
<URSI ID="07" Val="32.847" Name="MUF(D)" Units="MHz" QL="/" DL="/" />
<URSI ID="42" Val="2.650" Name="fmin" Units="MHz" QL="/" DL="/" />
<URSI ID="80" Val="5.150" Name="fminF" Units="MHz" QL="/" DL="/" />
<URSI ID="81" Val="2.650" Name="fminE" Units="MHz" QL="/" DL="/" />
<URSI ID="20" Val="2.860" Name="foE" Units="MHz" QL="/" DL="/" />
<URSI ID="51" Val="13.400" Name="fxI" Units="MHz" QL="/" DL="/" />
<URSI ID="16" Val="285.000" Name="h`F" Units="km" QL="/" DL="/" />
<URSI ID="04" Val="285.000" Name="h`F2" Units="km" QL="/" DL="/" />
<URSI ID="24" Val="98.890" Name="h`E" Units="km" QL="/" DL="/" />
<URSI ID="90" Val="94.590" Name="hmE" Units="km" QL="/" DL="/" />
<URSI ID="83" Val="4.494" Name="yE" Units="km" QL="/" DL="/" />
<URSI ID="86" Val="0.150" Name="FF" Units="MHz" QL="/" DL="/" />
<URSI ID="88" Val="12.200" Name="fMUF" Units="MHz" QL="/" DL="/" />
<URSI ID="89" Val="500.000" Name="h`(fMUF)" Units="km" QL="/" DL="/" />
<Custom Name="dlt foF2" Val="0.000" Description="Adjustment to the scaled foF2 during profile inversion" Units="MHz" />
<Modeled Name="foEp" Val="3.296" Units="MHz" ModelName="CCIR-79" />
<URSI ID="61" Val="5.150" Name="f(h`F)" Units="MHz" QL="/" DL="/" />
<URSI ID="60" Val="5.150" Name="f(h`F2)" Units="MHz" QL="/" DL="/" />
<Modeled Name="foF1p" Val="4.316" Units="MHz" ModelName="IRI-90" />
<URSI ID="92" Val="390.585" Name="hmF2" Units="km" QL="/" DL="/" />
<URSI ID="93" Val="284.901" Name="zhalfNm" Units="km" QL="/" DL="/" />
<Modeled Name="foF2p" Val="8.046" Units="MHz" ModelName="URSI-88" ModelOptions="NoStorm" />
<URSI ID="94" Val="147.044" Name="yF2" Units="km" QL="/" DL="/" />
<URSI ID="71" Val="74.923" Name="TEC" Units="TECU" QL="/" DL="/" />
<URSI ID="09" Val="80.959" Name="scale F2" Units="km" QL="/" DL="/" />
<URSI ID="D0" Val="177.900" Name="B0" Units="km" QL="/" DL="/" />
<URSI ID="D1" Val="1.390" Name="B1" QL="/" DL="/" />
</CharacteristicList>
<TraceList Num="2">
<Trace Type="standard" Layer="F2" Polarization="O" Num="160">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
5.15 5.2 5.25 5.3 5.35 5.4 5.45 5.5 5.55 5.6 5.65 5.7 5.75 5.8 5.85 5.9 5.95 6.0 6.05 6.1 6.15 6.2 6.25 6.3 6.35 6.4 6.45 6.5 6.55 6.6 6.65 6.7 6.75 6.8 6.85 6.9 6.95 7.0 7.05 7.1 7.15 7.2 7.25 7.3 7.35 7.4 7.45 7.5 7.55 7.6 7.65 7.7 7.75 7.8 7.85 7.9 7.95 8.0 8.05 8.1 8.15 8.2 8.25 8.3 8.35 8.4 8.45 8.5 8.55 8.6 8.65 8.7 8.75 8.8 8.85 8.9 8.95 9.0 9.05 9.1 9.15 9.2 9.25 9.3 9.35 9.4 9.45 9.5 9.55 9.6 9.65 9.7 9.75 9.8 9.85 9.9 9.95 10.0 10.05 10.1 10.15 10.2 10.25 10.3 10.35 10.4 10.45 10.5 10.55 10.6 10.65 10.7 10.75 10.8 10.85 10.9 10.95 11.0 11.05 11.1 11.15 11.2 11.25 11.3 11.35 11.4 11.45 11.5 11.55 11.6 11.65 11.7 11.75 11.8 11.85 11.9 11.95 12.0 12.05 12.1 12.15 12.2 12.25 12.3 12.35 12.4 12.45 12.5 12.55 12.6 12.65 12.7 12.75 12.8 12.85 12.9 12.95 13.0 13.05 13.1
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
285.000 290.000 290.000 292.083 294.167 296.250 298.333 300.417 302.500 304.583 306.667 308.750 310.833 312.917 315.000 315.000 320.000 320.000 321.250 322.500 323.750 325.000 330.000 330.000 330.000 330.000 331.667 333.333 335.000 340.000 345.000 343.750 342.500 341.250 340.000 345.000 345.000 345.000 345.000 345.000 350.000 350.000 350.000 350.000 350.000 350.000 355.000 355.000 360.000 360.000 360.000 360.000 365.000 365.000 367.500 370.000 370.000 370.000 370.000 375.000 375.000 380.000 380.000 380.000 385.000 385.000 387.500 390.000 390.000 390.000 390.000 395.000 395.000 395.000 397.500 400.000 405.000 405.000 405.000 405.000 405.000 410.000 411.667 413.333 415.000 415.000 415.000 417.500 420.000 420.000 420.000 420.000 425.000 425.000 425.000 425.000 425.000 430.000 430.000 430.000 430.000 430.000 430.000 430.000 435.000 435.000 435.000 435.000 440.000 440.000 440.000 440.000 442.500 445.000 445.000 445.000 445.000 446.875 448.750 450.625 452.500 454.375 456.250 458.125 460.000 462.500 465.000 467.500 470.000 470.000 472.500 475.000 477.500 480.000 480.000 485.000 490.000 490.000 495.000 495.000 500.000 500.000 510.000 515.000 518.420 522.177 526.325 530.927 536.064 541.832 548.357 555.798 564.363 574.326 586.061 600.086 617.145 638.341 665.387 701.091
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
48 48 48 0 0 0 0 0 0 0 0 0 0 0 48 48 54 48 0 0 0 48 48 0 51 45 0 0 54 57 0 0 0 0 51 60 60 60 54 54 60 66 63 63 0 51 63 63 60 63 63 63 63 66 0 57 63 0 60 60 60 54 60 57 51 54 0 48 57 60 60 57 60 63 54 63 54 0 60 66 66 66 0 0 57 45 60 0 63 66 57 57 63 0 60 57 51 57 60 57 57 54 48 45 51 54 54 54 57 0 0 54 0 57 0 54 48 0 0 0 0 0 0 0 54 0 51 0 48 51 0 54 45 54 54 54 48 54 51 54 54 54 51 48 45 54 54 51 51 51 48 45 48 51 48 45 0 39 39 39
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
0.390625 -0.390625 -0.390625 -0.390625 -0.390625 0.390625 1.953125 1.953125 0.390625 -2.734375 -1.953125 1.953125 2.734375 -0.390625 0.390625 -0.390625 -0.390625 2.734375 -0.390625 0.390625 -0.390625 -0.390625 0.390625 -0.390625 -0.390625 0.390625 1.953125 -0.390625 0.390625 0.390625 -0.390625 0.390625 0.390625 -0.390625 0.390625 0.390625 0.390625 0.390625 -0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 -0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 2.734375 -0.390625 -0.390625 0.390625 -0.390625 -0.390625 -0.390625 -0.390625 0.390625 0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 0.390625 0.390625 -1.953125 -2.734375 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 0.390625 -0.390625 -0.390625 -0.390625 -0.390625 0.390625 -0.390625 -0.390625 0.390625 0.390625 0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 -0.390625 0.390625 0.390625 -1.953125 -0.390625 0.390625 -0.390625 0.390625 -0.390625 -0.390625 0.390625 0.390625 -0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 -0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 -0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 0.390625 -0.390625 0.390625 0.390625
</TraceValueList>
</Trace>
<Trace Type="standard" Layer="E" Polarization="O" Num="5">
<FrequencyList Type="float" Units="MHz" Description="Nominal Frequency" >
2.65 2.7 2.75 2.8 2.85
</FrequencyList>
<RangeList Type="float" Units="km" Description="Group Range" >
98.890 99.420 99.991 100.612 101.292
</RangeList>
<TraceValueList Name="Amplitude" Type="integer" Units="dB" NoValue="0" Description="Relative Amplitude" >
51 0 0 0 51
</TraceValueList>
<TraceValueList Name="DopplerShift" Type="float" Units="Hz" NoValue="99.0" Description="Doppler Frequency Shift" >
2.734375 -1.953125 0.390625 -0.390625 -0.390625
</TraceValueList>
</Trace>
</TraceList>
<ProfileList Num="1">
<Profile  Algorithm="NH" AlgorithmVersion="4.33" Type="vertical" >
<Tabulated Num="188">
<AltitudeList Type="float" Units="km" Description="Altitude above station level" >
90.0 94.59 95.0 96.53 98.47 100.0 100.41 105.0 110.0 115.0 120.0 125.0 130.0 135.0 140.0 145.0 150.0 155.0 160.0 165.0 170.0 175.0 180.0 185.0 190.0 195.0 200.0 205.0 210.0 215.0 220.0 225.0 230.0 235.0 240.0 245.0 250.0 255.0 260.0 265.0 270.0 275.0 280.0 285.0 290.0 295.0 300.0 305.0 310.0 315.0 320.0 325.0 330.0 335.0 340.0 345.0 350.0 355.0 360.0 365.0 370.0 375.0 380.0 385.0 390.0 390.585 395.0 400.0 405.0 410.0 415.0 420.0 425.0 430.0 435.0 440.0 445.0 450.0 455.0 460.0 465.0 470.0 475.0 480.0 485.0 490.0 495.0 500.0 505.0 510.0 515.0 520.0 525.0 530.0 535.0 540.0 545.0 550.0 555.0 560.0 565.0 570.0 575.0 580.0 585.0 590.0 595.0 600.0 605.0 610.0 615.0 620.0 625.0 630.0 635.0 640.0 645.0 650.0 655.0 660.0 665.0 670.0 675.0 680.0 685.0 690.0 695.0 700.0 705.0 710.0 715.0 720.0 725.0 730.0 735.0 740.0 745.0 750.0 755.0 760.0 765.0 770.0 775.0 780.0 785.0 790.0 795.0 800.0 805.0 810.0 815.0 820.0 825.0 830.0 835.0 840.0 845.0 850.0 855.0 860.0 865.0 870.0 875.0 880.0 885.0 890.0 895.0 900.0 905.0 910.0 915.0 920.0 925.0 930.0 935.0 940.0 945.0 950.0 955.0 960.0 965.0 970.0 975.0 980.0 985.0 990.0 995.0 1000.0
</AltitudeList>
<ProfileValueList Name="PlasmaFrequency" Type="float" Units="MHz" Description="Plasma frequency" >
0.2 2.86 2.855 2.754 2.754 2.838 2.86 3.019 3.182 3.339 3.491 3.64 3.787 3.932 4.076 4.221 4.365 4.51 4.656 4.802 4.951 5.101 5.253 5.407 5.563 5.722 5.884 6.049 6.217 6.388 6.564 6.743 6.927 7.114 7.307 7.504 7.706 7.913 8.126 8.344 8.567 8.796 9.029 9.268 9.511 9.758 10.008 10.26 10.513 10.765 11.015 11.259 11.498 11.727 11.944 12.148 12.336 12.507 12.658 12.789 12.897 12.983 13.046 13.085 13.1 13.1 13.096 13.083 13.061 13.03 12.991 12.944 12.89 12.828 12.76 12.685 12.605 12.519 12.427 12.331 12.23 12.125 12.015 11.903 11.786 11.667 11.545 11.421 11.294 11.165 11.034 10.902 10.769 10.634 10.498 10.362 10.224 10.087 9.949 9.811 9.673 9.535 9.397 9.259 9.122 8.986 8.85 8.715 8.58 8.447 8.314 8.183 8.052 7.923 7.794 7.667 7.542 7.417 7.294 7.172 7.052 6.933 6.815 6.699 6.584 6.471 6.359 6.249 6.14 6.033 5.927 5.823 5.72 5.619 5.519 5.421 5.324 5.228 5.134 5.042 4.951 4.862 4.773 4.687 4.601 4.518 4.435 4.354 4.274 4.196 4.119 4.043 3.968 3.895 3.823 3.752 3.683 3.614 3.547 3.481 3.416 3.353 3.29 3.229 3.168 3.109 3.051 2.994 2.937 2.882 2.828 2.775 2.723 2.672 2.621 2.572 2.524 2.476 2.429 2.383 2.338 2.294 2.251 2.208 2.166 2.125 2.085 2.046

</ProfileValueList>
</Tabulated>
<ShiftedChebyshevList Num="2" >
<ShiftedChebyshev Region="E" StartFrequency="0.2" EndFrequency="2.86" PeakHeight="94.59" Num="3" Error="1.716">
-6.758 2.815 -0.647
</ShiftedChebyshev>
<ShiftedChebyshev Region="F2" StartFrequency="2.86" EndFrequency="13.1" PeakHeight="390.585" Num="5" zHalfNm="284.901" Error="2.819">
-252.017 -49.241 6.367 5.731 -1.015
</ShiftedChebyshev>
</ShiftedChebyshevList>
<ProfileValley Model="ULCAR" Width="5.82" Depth="0.106"/>
<TopsideChapman PeakHeight="390.585" PeakDensity="2129156.2" PeakScaleHeight="80.959" />
</Profile>
</ProfileList>
</SAORecord>
</SAORecordList>
